Load transfer device



May 2, 1950 R. c. YEOMAN 2,505,930

' LOAD FER DEVIC Patented May 2, 195@ Ray Cyrus Yemen, Lufkin,` TeX-l4 assigner to Texas Foundries,` Inc., Lufkin, Tex., a corpora-` tion cf Texas Application March 21, 194'5, SeralNo. 583,945`

4` Claims. (Cl. 9,4.- 8)

This invention relatesy to load transfer devices andrmore particularly to devices for transferring loads, between `adjacent slabs oi' concrete or the llka,

One of the objects of the invention is to provide a simpieand inexpensive load transfer device for transmittingvertical loads between adjacent slabs and for limiting relative horizontal movement of the slab faces.

Another object is to provide a load transfer device formed of substantially identical plates to be imbedded in the slabs respectively and having. engaging parts. thereon to` prevent separation offthe plates while permitting limited relative sliding movement thereof.`

Still another object is to provide a load transfer dex/rice in which the platesv are formed with openings therethrough and with hooks to extend through openings in the opposite plates so that separation of the plates` isprevented while relative sliding movement thereof is permitted.

The above and other objects and advantages of the invention will be more readily apparent from the following description when read in connection with the accompanying drawing, in Which- Figure 1 is a partial horizontal section through a pair oi adjacent slabs connected by a load transfer device embodying the invention;

Figure 2 is a partial vertical section on the line 2 2 of Figure 1; and

Figure 3 is a perspective View of one of the plates.

As shown ln Figures 1 and 2 the load transfer device of the invention connects a pair of concrete slabs Il) and li having a filler strip I2 between their adjacent faces. The iiller strip I2 may be any desired type of expansible material such as asphaltic material, compressed wood or fabricated metal joint strips.

The load transfer device is formed by a pair of identical plate members I3 imbedded in the slabs respectively and which may have openings Il?r therethrough securely to fasten the plates in the slabs. Each of the plates projects beyond the end of the slab in which it is imbedded into the opposite slab. A strip of yielding material I5, such as rubber or asphaltic material, is arranged opposite the end of each plate to permit yielding movement thereof in the opposed slab under expansion or contraction of the slabs.

In order to secure the plates together each of the plates is formed in its projecting end portion with a series of openings I5 therethrough. Preferably the openings are formed by punching out strips of met-al from the plates which are then bett cctv/@rdn imm the and turned back. at the @ed t0 provide a heet member .Il y

InI assemblies the plates the hook member l1 of each pla-te` eigt through the opening I6 in the other plete @se Reeks @ver the other slate Sniace se that the plates are held together against lateral separation. If desired,` the, ook members and plates. maree `sleasei to' facilitate Sliding, .and te 1111s adhesive 0f @secrete there 'bo- Tbe hook members: and openings are lons @gov-sh te permit relative .Sliding 0f the plates Withovtseeretiea f After the plates are assembled, the openings Iii between the hooi; portions are filled with plastic material such asrubber, asphalt composie tionor the like,f as shown at i8, This materia-l mail? D@ illvfted .aS- pfolfrmf Plugs G1 maybe pressed into the openings as. a plastic mass to lill them as. indicated Durme noun-ne of the @ver Grete this materiel prevents the @decretel free s the @remesa and Wilt comprese when the slabs expand to accommodate closing of the joint.

In use with the plate members installed in the slabs as shown any vertical loads on one of the slabs will be transmitted through the plate member imbedded therein and directly through the overlapping portions of the plates or through the hook members, depending upon the direction of the load, to the opposite slab. As the slabs expand and contract the projecting end portions of the plates may move in the opposite slabs by compressing or moving away from the yielding material I5 and without disengaging the hook portions I'I from the plates. At the same time the c hook portions il will compress or relieve the pressure on the yielding material I8. It will be understood that the hooks Il and openings i6 are made long enough to accommodate the expected amount of movement in response to expansion or contraction of the slabs without disengaging. l'f the slabs should tend to separate to an excessive extent, the hook members will engage the opposite plates at the ends of the openings IB therethrough to prevent excessive separation of the slabs which might move their faces out of sealing engagement with the iiller strips I2.

While one embodiment of the invention has been shown and described in detail, it will be understood that this is illustrative only and is not intended as a definition of the scope of the invention, reference being had for this purpose to the appended claims.

What is claimed is:

l. A load transfer device for use with adjacent slabs of concrete or the like comprising a pair of plate members adapted to be imbedded in the slabs respectively with their ends projecting beyond the slabs and lying in face to face relationship, each of the plates having an opening therethrough and an outwardly extending hook member of smaller horizontal section than the opening adjacent one end of the opening, the hook member on each plate extending through the opening in and hooking over the other plate to prevent separation of the plates while permitting relative sliding thereof the opening being filled with yielding material at one side of the hook member.

2. In combination with adjacent slabs of concrete or the like a load transfer comprising a pair of plate members imbedded in the slabs respectively with their ends projecting beyond the slabs and lying in face to face relationship, the projecting end of each plate extending into the opposite slab, a strip of yielding material between the projecting end of each plate and the slab to permit relative movement therebetween, one of the plates having an opening therein, and a part on the other plate smaller than the opening and extending therethrough to hold the plates together while permitting relative sliding movement thereof.

3. In combination with adjacent slabs of concrete or the like a load transfer device comprising a pair of plate members imbedded in the slabs respectively with their ends projecting beyond the slabs and lying in face to face relationship, the projecting end of each plate extending into the opposite slab, a strip of yielding material between rthe projecting end of each plate and the slab to permit relative movement therebetween, each of the plates being formed with an opening through its projecting end portion, and each of the plates being formed with an outwardly extending hook member adjacent the opening therethrough to extend through the opening in and hook over the other plate to hold the plates together while permitting relative sliding thereof.

4. In combination with adjacent slabs of concrete or the like a load transfer device comprising a pair of plate members imbedded in the slabs respectively with their ends projecting beyond the slabs and lying in face to face rela.- tionship, the projecting end of each plate extending into the opposite slab, a strip of yielding material between the projecting end of each plate and the slab to permit relative movement therebetween, each of the plates being formed with an opening through its projecting end portion, and each of the platesbeing formed with an outwardly extending hook member adjacent the opening therethrough of smaller horizontal section than the opening to extend through the opening in and hook over the other plate to hold the plates together while permitting relative sliding thereof, the openings being lled with plastic material at one side of the hooks extending therethrough which is adapted to be compressed as the plates move toward each other.

RAY CYRUS YEOMAN.

REFERENCES CITED The following references are-of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 995,691 Latham June 20, 1911 1,225,710 Herschede May 8, 1917 1,900,705 Galassi Mar. 7, 1933 2,066,052 Plym Dec. 29, 1936 2,161,225 Fischer June 6, 1939 2,201,134 Brickman May 21, 1940 2,212,680 Brickman Aug. 27, 1940 2,294,550 Greulich Sept. 1, 1942 2,319,049 Fischer May 11, 1943 Certificate of Correction Patent No. 2,505,980 May 2, 1950 RAY CYRUS YEOMAN It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows:

Column 3, line 15, after the Word transfer insert device;

and that the said Letters Patent should be read as corrected above, so that the same may conform to the record of the oase in the Patent Office. Signed and sealed this 3rd day of October, A. D. 1950.

[SEAL] THOMAS F. MURPHY,

Assistant Commissioner of Patents. 

